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I have a lot of test equipment that could be used for
Field strength measurements but I would not venture to estimate any stations ERP
because there are too many variables. I believe what they tell me and if its
plus/minus a bit so what!!!!!!!!!!!11
I am now happy Paul has settled down.
G3KEV
----- Original Message -----
Sent: Wednesday, February 16, 2011 4:35
PM
Subject: RE: LF: TA TONITE
Hi
Chris,
You
are probably right, most amateurs would not have the sort of kit I have
available at work, but for home use some very good measuring equipment at
LF is certainly available to amateurs on the surplus market, both Mal and
myself have Siemens D2155 SLMs, for example (and it not too
expensive, less than most rice boxes), and calibration is quite easy - even
for antennas - to get very accurate field strength measurements. The problem
then comes down to predicting the propagation characteristics - and
this IS the problem area, I quite agree. Having dealt with LF propagation
in a 'marine' context I'm well aware of the variability of the
models!
I
may have been too hasty in responding to Mal but he does have that effect on
people :-)
73
Paul G8GJA
Hi Paul,
I think Mal was quite rightly referring to test
equipment available to the professionals as opposed to 'us'
amateurs.
There was a discussion on here a year or so ago
where it was generally agreed that most of our 'estimates' at ERP had quite
a large degree of likely error!
Vy 73,
Chris, G4AYT.
----- Original Message -----
Sent: Wednesday, February 16, 2011
3:24 PM
Subject: RE: LF: TA TONITE
Mal,
The reference ...'especially by Radio Amateurs' could
well be considered offensive and is definitely not borne out by fact. I
suppose that the only qualified people would be marine radio
officers?
I will not request a retraction - knowing you it would not be
forthcoming - but could you be a bit careful with sweeping generalisations
in the future?
Paul G8GJA
Toni
It is all Guesswork trying to measure ERP some
hundreds of miles away. especially by Radio Amateurs.
I have seen figures in the past and after a
detailed mathematical analysis the concluded statement was that this
could be 6 dB either way, in other words the erp measured could be
1W erp or maybe 4w erp or even worse a lot less.
Let them believe what they like hi
g3kev
----- Original Message -----
Sent: Wednesday, February 16,
2011 1:08 PM
Subject: Re: LF: TA TONITE
Thanks Rik
I've read somewhere that DCF39 has 40kW
EIRP. So we would have around 4W EIRP. Last week a station measured
our field strength, 100km away and came to 0.4WEIRP. This is probably
a little bit to low. Anyway, it shows me again, that most amateurs
overestimate their ERP. Even Mal has probably not the Watt he claims
;-)
73 de Toni
2011/2/16 Rik Strobbe <[email protected]>
Hello Toni, group,
I measured
the HE3OM signal 41dB down
on DCF39.
Distances to HE3OM (504km)
and DCF39 (515km) are almost identical.
This might give the US stations a clue
what signal strength they can expect from HE3OM and what QRSS speed
Tony could use to be copied.
73, Rik ON7YD
Dear Jim, Mal and LF Group Unfortunately the tower is
not nearby my house and I can't leave the station running
unattended. And the nights I can spend in Sottens are limited by my
health and my wife, hi. So there is no trial before, I have just
next Friday night. If I take a look at the reports we got in the
past two weeks from stations 2000-3000km away (always good audible),
it should be possible to span 6000km using QRSS10. On the
receiving side, we may be able to see stations let's say with
QRSS60. This would mean, that we could make only one or two QSO's.
May be it's better to try Crossband: we transmit in QRSS10 and
listen on 80m. This would give more stations the opportunity to
contact us. However, if there is a station from the East Coast we
copy in QRSS10 it would get the priority. What do you think about
this approach? 73 de Toni
2011/2/15 James Moritz <[email protected]>
Dear
Toni, LF Group,
HE3OM has the advantage of a much stronger
TX signal than most Eu stations, so I guess you have a good chance
of being copied in NA on Friday night, unless the propagation is
very poor. But as you will have seen from the activity last
weekend, forward planning is always a good thing, especially where
a single QSO takes hours. If possible, I would suggest
transmitting some beacon signals from HE3OM between now and
Friday, so that North American stations can get a good idea what
QRSS speed can be copied from your station. Also, try to receive
any W/VE beacons that might be running, so that you also know what
the requirement will be in the other direction. Finally, I have
usually found reception of US stations is best just before dawn
here, so make sure you are not going to be busy on
Saturday!
Good luck,
Cheers, Jim Moritz
73 de M0BMU
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